Why was my signature edited?

[Disruptor]

So I made a cool new achievement to post in my signature. I had also taken a picture in game of my points, to post in there too. So when I did this it looked fine, then I kept getting errors where it would just say the link to the photo and say "Your signature has been modified. Please read the rules." Nothing is inappropriate. I just want a new achievement and photo in my signature....
Here are the photos.

And

 

[The_Soy_Man]

I thought it meant that your sig was too big. It looks fine to me

 

[CandyFTW]

Its caus your sig is to big/long but actuzlly its fine for me.

 

[Disruptor]

Three pictures is too long?
This is all I have: